* Avoid `assert.includes()` in Bridge test, since this does a deep
   equality comparison which is much more expensive than necessary
   (50-60ms to execute on a desktop system with no contention. I think
   this might explain the very occassional failure seen on Travis).

 * Use the correct name for the `retries` option in a
   retryPromiseOperation() test. This test should have failed but
   because the min timeout value was set so low, the test was taking < 2
   seconds to run even though it was retrying 10 times with an
   expontentially increasing timeout.